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Thread: ZCS coding for RLS retrofit

  1. #1
    Join Date
    May 2019
    Location
    Pittsburgh
    Posts
    61
    My Cars
    1998 BMW 740iL

    ZCS coding for RLS retrofit

    Hi all,

    I just completed a RLS (rain/light sensor) retrofit on my E38 which was never equipped with either a rain sensor or auto headlights. The LCM was also replaced with a LCM IV and coded to the car. The auto headlights part works perfectly. My question, though, is how do I add the rain sensing wipers option to the GM3? Looking online, it appears I might have to modify the ZCS and factory options list. I've attempted to do so on my NCS Expert computer, however I haven't been successful. If there are any ZCS experts here who can provide input, I'd be very thankful!

    I was able to find the option (S521) in the E38ZST.000 file and added the values in the SA number field (does 8+2 = 0? this may be my problem), but I've never been able to get the coding completed. It always errors out with a "faulty coding key" when trying to finish. If I change no numbers (just go through the ZCS coding process and provide the already installed numbers), coding works fine. Attached are pictures of my current attempts.

    Any help would be much appreciated!

    0.jpg0-1.jpg0-2.jpg0-3.jpg
    E38 1998 740iL - Arctic Silver Metallic - 170k
    BMW CCA # 573127

  2. #2
    Join Date
    Jul 2009
    Location
    Greenville, SC
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    2,890
    My Cars
    01 749iM/6 sporty
    8+2 = 10 The 1 has to be added to the next column.
    Trevor
    01 749i sporty, build 12/00 "Sports Barge",S62
    92 VW Corrado VR6,AAA
    81 Delorean,B28F
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    03 VW Passat wagon 4.0 W8 6spd

  3. #3
    Join Date
    Oct 2019
    Location
    Lake Arrowhead
    Posts
    159
    My Cars
    1997 740iL BMW
    not informed on it but is that hexadecimal? as in A = 10 or 1010 in binary ?

    - - - Updated - - -

    new to me, I never could get the programs for the computer hookup to do much on the 1997 740iL.....

  4. #4
    Join Date
    May 2019
    Location
    Pittsburgh
    Posts
    61
    My Cars
    1998 BMW 740iL
    Got the ZCS coded today. Turns out you have to remove the last digit from each line when calculating new checksums, and 8+2=A as the ZCS is in hexadecimal. Now to find where in the GM to enable the rain sensor...
    E38 1998 740iL - Arctic Silver Metallic - 170k
    BMW CCA # 573127

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